On a cPanel server, where SSH worked yesterday, I suddenly can’t login with SSH. I get “Access Denied.”
I checked that logins with passwords are enabled in /etc/ssh/sshd_config and they are. I tried logging in as root via KVM then SSH’ing to localhost, it works.
I’ve tried multiple accounts, even creating a new account but it won’t work and I’m sure the passwords are correct because I’ve reset them multiple times and even copy-pasted them into Putty, not to mention they work via KVM.
I don’t know of anything that happened that would cause this to change overnight.
I’ve also checked sshd_config for AllowUser directives which allow you to restrict access to a certain IP, but it doesn’t have any.
And another point, I just checked it on my phone’s 4G and it works there, just not on my DSL.
In the past the connection on my DSL has been slow and spurious to my server. Even after moving to a different host in a different country. At those times every other site I try works fine. Not sure if relevant.
Here's the output of ssh -v using Git for Windows' SSH.
OpenSSH_6.6.1, OpenSSL 1.0.1i 6 Aug 2014 debug1: Connecting to <host> [<IP>] port 22. debug1: Connection established. debug1: identity file /.ssh/id_rsa type -1 debug1: identity file /.ssh/id_rsa-cert type -1 debug1: identity file /.ssh/id_dsa type -1 debug1: identity file /.ssh/id_dsa-cert type -1 debug1: identity file /.ssh/id_ecdsa type -1 debug1: identity file /.ssh/id_ecdsa-cert type -1 debug1: identity file /.ssh/id_ed25519 type -1 debug1: identity file /.ssh/id_ed25519-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.6.1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.3 debug1: match: OpenSSH_5.3 pat OpenSSH_5* compat 0x0c000000 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<3072<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA <key> The authenticity of host '<host> (<IP>)' can't be established. RSA key fingerprint is <key>. Are you sure you want to continue connecting (yes/no)? yes Warning: Permanently added '<host>,<IP>' (RSA) to the list of known hosts. debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password debug1: Next authentication method: publickey debug1: Trying private key: /.ssh/id_rsa debug1: Trying private key: /.ssh/id_dsa debug1: Trying private key: /.ssh/id_ecdsa debug1: Trying private key: /.ssh/id_ed25519 debug1: Next authentication method: password <user>@<host>'s password: debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password Permission denied, please try again. <user>@<host>'s password: 3 Answers
In the past the connection on my DSL has been slow and spurious to my server. Even after moving to a different host in a different country. At those times every other site I try works fine. Not sure if relevant.
Based on the debugging output of ssh -v you are showing — and your comment above which I think is relevant — I would recommend adjusting the sshd_config on your server like this; note that I like to use nano but feel free to use whatever text editor you prefer using.
First, open up the ssh_config file like this:
sudo nano /etc/ssh/sshd_config There should be a configuration area called GSSAPI options that looks like this:
# GSSAPI options #GSSAPIAuthentication no #GSSAPICleanupCredentials yes Change that to uncomment the line that reads GSSAPIAuthentication no:
# GSSAPI options GSSAPIAuthentication no #GSSAPICleanupCredentials yes Finally, save that file and restart the SSH server daemon like this. To restart SSH on a RedHat/CentOS-based system do this:
sudo service sshd restart To restart SSH on a Debian/Ubuntu-based system do this:
sudo service ssh restart Now try logging in again. I would still recommend ssh -v for debugging purposes, but I believe this will clear things up.
I reinstalled the openssh-server package and it seems to have worked, for now. The sshd_config file did not change from how I had it last so it's very strange.
In my case, this 73rd line in sshd_config was the culprit. No where else found this solution, just struck it with luck. Either comment it out (or make it 'yes'):
KbdInteractiveAuthentication no
Perhaps this prohibits keyboard interaction while logging into remote server.
